Landfill Gas Detection

 

Measurements for detecting gas migration in landfills are usually carried out in an area of approximately 1000 m2, for which a 3D-setup measure at time intervals, approximately twelve times per day. If necessary, an initial large-scale scanning over a larger area of resistivity or other geophysical method to be done to facilitate the choice of site for further investigations.

 

Resistivity and induced polarization (IP) are non-destructive geophysical methods to measure sub-surface electrical properties by electrical current being transmitted between electrodes placed at the surface. Underground zones containing gas are signaled by relatively high resistivity, which means a high resistance to current, while zones with relatively high water content are signaled by lower resistivity. Research has also shown that zones with high gas content and migration of gas is signaled by high resistivity variation over time, due to the gas and water interaction in the soil pore system. Therefore, sub-surface landfill gas migration can be detected in the ground by measuring the change in resistivity over time.

Results of measurements for gas detection can be used for:

 

• Optimize the placement of gas extraction systems

• Test the effect of gas wells in operation

• Identify sensitive or dynamic areas of the landfill for gas movement

• Provide a basis for a conceptual picture of the gas flow at a specific landfill

• Examining how the gas flows in and out of the landfill affected by changes in weather conditions.

 

For further information, please contact:

 

Håkan Rosqvist at hakan.rosqvist(at)tyrens.se

Torleif Dahlin at torleif.dahlin(at)tg.lth.se

Mats Svensson at mats.svensson(at)tyrens.se

 

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Copyright (c) 2012 MaLaGa. All Rights Reserved.

Håkan Rosqvist at hakan.rosqvist(at)tyrens.se

Torleif Dahlin at torleif.dahlin(at)tg.lth.se

Mats Svensson at mats.svensson(at)tyrens.se